You guys, I’ve been filming and editing and rendering like crazy these last few days to get ready for HIITmas, and I’m so excited that it’s finally here. Twelve days, twelve new HIIT workouts, and they’re all just 12 minutes long! Oh, yeah, and there’s an Instagram contest, too! (If you click on that link, it’ll take you to the post I wrote the other day with all the details.)

These workouts are all super simple, but oh my goodness, they’re not easy! I actually went out of my way to make sure that you’d get a good sweat in a very short amount of time. Twelve minutes doesn’t sound long (because it’s not, you can totally squeeze this workout into your day!), but it’s plenty of time for a great workout.

Today for Day ONE, there’s no equipment needed and the set-up is very straightforward: 12 exercises done for 50-second intervals each, no repeats. You can follow along with me in real time with the video below, or you can print out this breakdown and take it with you wherever you go: